High-tension insulator



Jan. 2% 1936 P. E. STEWART HIGH TENSION INSULATOR Fild Oct. '5, 1926 v INVENTOR.

. I I 1 I I ATTORNEYS;

Patented Jan. 28, 1930.

various causes, thereby eliminating outages PHILIP B. STEWART, OF CINCINNATI, OHIO HIGH-TENSION INSULATOR Application. filed October 5, 1926. Serial No. 139,738.

I invention relates to the provision of means in addition to the insulators employed with high tension electrical transmission lines for clearing flash overs from the lines, from to the circuit, and damage to the line.

The theory of my invention is to provide a suitable gap across the insulator in series with a fuse, which is capable of interrupting the current of the line to ground.

The invention is arranged for use on an insulator of a type used for high tension trans mission lines, wherein astring of insulators serve to support the transmission wire. "A metal grading ring is preferably used to define a path of discharge, which metal ring is attached to the string of insulators at an intermediate point. I then employ a fuse which is located between the transmission conductor and the grading ring.

There are various possiblearrangements, and I will describe a specific construction whereby I accomplish my objects, it being understood that the specific construction is exemplary only of my invention, and embodies the preferred form thereof. I will set forth the novelty inherent in my invention in the appended claims.

In the drawings V Figure 1 is a side elevation of the device complete. v

Figure 2 is a detail of one of the upper horns.

ring.

Figure 4 is a detail of one half of the supporting clamp for the grading ring.

- I have shown a series of insulators 1, joined together in the usual manner. The clamp 2, which serves to support the transmission wire 3 on the insulator, is of regular type, and to it is bolted the fuse arm 4, which is thus in electrical contact with the line.

At some suitable space above the cable or line support, a'pair of clamp plates 5, having arms 6, are bolted together around one of the insulators. Secured to one of the clamp arms is a fuse clip 7 and secured to the fuse arm 4 is secured a fuse clip 8. The fuse 9 is set between the clips.

Figure 3 is a detail of half of the-grading Secured to the arms 6 are the two loops or half rings 10, which when erected, extend on both sides of and surround the insulator.

Secured near the upper end of the insulator string are the horns 11, which have curved portions 12, that are set around the body of the upper insulator, and bolted together about the insulator. In case of a discharge of lightning or some sudden surge discharge in the line, the tendency to flash-over will take a path through the fuse to the grading ring forme'd'by the two half rings 10, and from the grading ring to the horns across the air gap, this being easier than a path directly through the insulator string or closely in line with it.

However, the fuse which carries the current to the grading ring will blow and break the path of discharge to the grading ring, thus avoiding an interruption of service to the circuit and damage toother parts of the line. When the fuse blows, it will not in any way interfere with the regular functioning of the insulators, and it will be easy 'for the linemen to see blown fuses in their regular inspections which are made from the ground with field glasses as a regular practice at the present time.

Some'other sort of gap could be provided, and the-mechanical structure described replaced with some equivalent structure, so long as a gap across the insulator is provided in series with a fuse for interrupting the current from the line to ground.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. An insulator device comprising an insulator, means creating a path for flashovers across the insulator so as to short the insulator, and a fuse arranged in series with the said path,and a conductor supported by the insulator and connected to said fuse.

2. An insulator device comprising a string of insulators, means intermediate the ends direct path from saidcon ductor to the said intermediate flash-over means.

- .3. An insulator device'comprising a string of insulators, a grading'ring mounted on the insulators intermediate the ends of the' string, an electric conductor supported on one end of the string, and a .fuse from the electric V conductor to the grading ring.

4. An insulator device comprising an in;

-sulator,-means creating a path for flash-overs across the insulator, and a fuse arranged in series with the said path, said fuse being long enough to avoid easy flash over around the fuse in case of a surge discharge'from' the line and being dire'ctlyjconnected with the con uctor.

5. Thepcombin'ation with a'strin'g'of.

4 sulators for suspending;a-conductorfrom a sudden electrical surge in the line, and means stationary support, of electrode means carried by the intermediate portionof the string of insulators for roviding a flash-over pathv I at one side thereo and a fuse connected with the conductor interposed in serieswith. said path and adapted to be blown upon the loccurre'nce of a flash-over for extinguishing the 6. In combination with a string'of insu lators for suspending a conductor from a stationary support, protective means for thestring comprising electrodesrcarried thereby. in spaced and insulated relation to the sup-' port and providing an air gap adapted to be jumped by an arc in the event of a flash-oven; and means arranged in series with the gap I and connected'with the conductorufor extinguishing the arc in the event ofa flash-over. 7 combination with aninsulator mefchanically connected with a high tension conductor, protective means comprising eleo'- trodes carried by theinsulator and providinga flash-over path for an arc resulting from a.

interposed in series with said path and con- PHILIP- B. 31mm; 1

nected'w'ith the conductor for disrupting-an .arc. 

